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In both types, the vapor from the suction line is drawn into the cylinder through the suction port.Īs the blade rotates, trapped vapor in the space ahead of the blade is compressed into high pressure gas after which it is discharged to the condenser through the exhaust port. The other type has the blade which remains stationary and is part of the compressor housing assembly. One has blades or vanes that rotate with the shaft. The rotary compressor can be divided into two types. The low pressure refrigerant enters one end of the compressor and the resultant high pressure refrigerant is discharged into the opposite end to the condenser. The male rotor and the female rotor are built inside the cylinder. In HVAC, they are usually used in systems with 20 ton capacity and above. The screw compressor uses a pair of helical rotors where it traps and compresses the gas as the rotors revolve in the cylinder. The scroll compressor is also known as scroll pump or scroll vacuum pump. This advantage is translated to a smooth and quiet operation. The advantage of scroll compressor is that it has fewer moving parts and less torque variation compared to the reciprocating compressor. It is then discharged though the center port to the condenser. When this happens, the pockets of refrigerant between the two scroll are slowly pushed to the center of the two scrolls causing the reduction of the volume of the gas. The common ones are the two-cylinder, four-cylinder and eight-cylinder compressorsĪ scroll compressor has one fixed scroll which remains stationary and another moving or orbiting scroll that rotates through the use of swing link. The compressor may has more than one cylinder which is also known as multicylinder compressor. As the piston moves upward, it compresses the vapor refrigerant which is then pushed through the exhaust valve into the condenser. Vapor from the suction line is moved through the intake valve as the piston move downward. The piston moves up and down inside a cylinder.
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This rotary motion is achieved by the use of an electric motor and the construction is quite similar to that of an automobile engine. The reciprocating compressor uses piston to compressor the refrigerant driven by a crankshaft in a straight line back and forth motion.